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z in (-oo:+oo)
32 = (12/4)*(z-1) // - (12/4)*(z-1)
32-((12/4)*(z-1)) = 0
32-3*(z-1) = 0
32-3*(z-1) = 0
35-3*z = 0
35-3*z = 0
35-3*z = 0 // - 35
-3*z = -35 // : -3
z = -35/(-3)
z = 35/3
z = 35/3
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